Solving Equations Using Tables and Graphs
In a relationship between two variables, if you know the value of one
variable, you can use a table or a graph to find the value of the other
variable. For example, suppose Alana raises $10 from a sponsor in the
walkathon from Problem 1.3. Then you can ask: How many kilometers
does Alana walk?
In the equation A = 5 + 0.5d, this means that A = 10. The equation is now
10 = 5 + o.5d.
• What value of d will make this a true statement?
Finding the value of d that will make this a true statement is called solving
the equation for d. You can use tables or graphs to find the missing value.
In this Investigation, you will develop strategies for solving equations
symbolically, using properties of operations and equality.